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High-carbon chromium bearing steel GCr15 and production method thereof

A technology of high-carbon chromium bearing steel and its production method, which is applied in the field of high-carbon chromium bearing steel GCr15 and its converter production, can solve problems such as titanium nitride inclusions and affecting the fatigue life of steel, and achieve improved performance, improved processing performance, and increased Effect of fatigue life

Inactive Publication Date: 2012-02-15
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitrogen remaining in the high-carbon chromium bearing steel is easy to combine with titanium in the steel to form angular, high-melting titanium nitride inclusions, which seriously affects the fatigue life of the steel; the nitrogen content is <0.0055% (that is, 55ppm) It is the bottleneck of the current DC (direct current electric furnace) production process

Method used

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  • High-carbon chromium bearing steel GCr15 and production method thereof
  • High-carbon chromium bearing steel GCr15 and production method thereof
  • High-carbon chromium bearing steel GCr15 and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Primary smelting: Prepare materials according to the following ratio: 65t of molten iron, 5t of scrap steel, first add scrap steel and then add molten iron; send the raw materials into the primary smelting furnace for smelting at 1600°C, and adjust the C content to 0.06wt at the end of smelting %, using a sliding plate to block slag to tap steel to achieve slag-free tapping, the steel ladle is added with 200kg refining slag for slag washing and combined with strong deoxidation and pre-deoxidation;

[0048] (2) Refining: heat the molten steel to be refined for re-refining, add deoxidizer aluminum particles at 0.2kg / t, quickly make white slag, control the basicity of steel slag to 4.0, the sulfur content is 0.025wt%, and the phosphorus content is 0.015wt%. Add 7 packs of large packs of covering agent to cover the liquid surface, blow Argon softly, strictly control the argon pressure to ensure that the liquid surface is not exposed, and refine for 45 minutes;

[0049] ...

Embodiment 2

[0055] (1) Primary smelting: prepare materials according to the following ratio: 66t of molten iron, 4t of scrap steel, first add scrap steel and then add molten iron; send the raw materials into the primary smelting furnace for smelting at 1660°C, and adjust the C content to 0.08wt at the end of smelting %, using a sliding plate to block slag to tap steel to achieve slag-free tapping, the steel ladle is added with 300kg refining slag for slag washing and combined with strong deoxidation and pre-deoxidation;

[0056] (2) Refining: heat the molten steel to be refined for re-refining, add deoxidizer aluminum particles at 0.3kg / t, rapidly make white slag, control the basicity of steel slag to 5.0, the sulfur content is 0.020wt%, and the phosphorus content is 0.010wt%. Add 10 packs of large packs of covering agent to cover the liquid surface, blow Argon softly, strictly control the argon pressure to ensure that the liquid surface is not exposed, and refine for 48 minutes;

[0057]...

Embodiment 3

[0063] (1) Primary smelting: Prepare materials according to the following ratio: 68t of molten iron, 2t of scrap steel, first add scrap steel and then add molten iron; send the raw materials into the primary smelting furnace for smelting at 1680°C, and adjust the C content to 0.10wt at the end of smelting %, use sliding plate to stop slag to tap steel to realize slag-free tapping, and use ladle plus 350kg refining slag for slag washing and combination of strong deoxidation and pre-deoxidation in the tapping process;

[0064] (2) Refining: Before refining the molten steel, send the pouring waste produced in step (1) into the molten steel to be refined in the ladle refining furnace (LF furnace) for heating and re-refining, and add deoxidizer aluminum at 0.4kg / t granule, quickly make white slag, control the alkalinity of steel slag to 6.0, sulfur content to 0.018wt%, phosphorus content to 0.010wt%, add 12 packs of large bags of covering agent to cover the liquid surface, blow Ar s...

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Abstract

The invention relates to high-carbon chromium bearing steel GCr15 and a production method thereof. The bearing steel comprises the following components by weight percent: 0.85%-1.15% of C, 0.10%-0.40% of Si, 0.20%-0.50% of Mn, 1.30%-1.75% of Cr, 0.004%-0.020% of S, 0.005%-0.025% of V, 0.003%-0.015% of Ti, 0.010%-0.030% of Al, 0.0002%-0.0007% of O, 0.0020%-0.0060% of N and the balance of Fe and inevitable impurities. The production method comprises the following steps of: performing primary smelting, refining, performing vacuum degassing, feeding silicon-barium wires, performing continuous pouring, rolling and performing post-treatment. Compared with the prior art, the production method can be used to realize low cost and ensure the comprehensive mechanical property of the product; and theobtained product is characterized by low oxygen content, low nitrogen content and low inclusion content.

Description

technical field [0001] The invention relates to a bearing steel and a production method thereof, in particular to a high-carbon chromium bearing steel GCr15 and a converter production method thereof. Background technique [0002] Bearing steel can be divided into high-carbon chromium bearing steel, carburized bearing steel, medium-carbon bearing steel, stainless bearing steel, and high-temperature bearing steel according to the carbon content and use of the steel. GCr15 is the most commonly used high-carbon chromium bearing steel with high hardenability. The critical hardening diameter in oil is about 18-40mm (50% martensite); Average property, sensitive to white spot formation, temper brittleness, good overall performance. Generally, it is used after quenching and low temperature tempering. Good machinability after spheroidizing annealing. After quenching and tempering, the hardness is high and uniform, the wear resistance and contact fatigue strength are high, and the h...

Claims

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Application Information

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IPC IPC(8): C22C38/28
Inventor 刘树涛刘江伟李学刚张献昭曹娜董诗朋
Owner CHENGDE JIANLONG SPECIAL STEEL
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